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JEE Main & Advanced Chemistry Classification of Elements and Periodicity in Properties / तत्त्वों का वर्गीकरण एवं गुणों में आवर्ति Question Bank Critical Thinking

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    Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species [CBSE PMT 2005]

    A) \[Cl<F<S<O\]

    B) \[O<S<F<Cl\]

    C) \[S<O<Cl<F\]

    D) \[F<Cl<O<S\]

    Correct Answer: B

    Solution :

    Halogens have very high electron affinities. It may be noted that the electron affinity of fluorine is unexpectedly low \[(<Cl)\]. This may perhaps be due to the small size of the F atom. The values of electron gain enthalpies for Cl,F, S and O are respectively 349, 333, 200 and 142 kJ/mole hence correct order is Cl>F>S>O.


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